P0171 on the Final-Year 2023 Dodge Challenger
A P0171 code on your 2023 Dodge Challenger indicates the PCM has detected a lean air-fuel mixture on Bank 1. The 2023 Challenger was the last model year for the iconic muscle car and came with the 3.6L Pentastar V6, 5.7L HEMI V8, 6.4L HEMI V8, and the supercharged 6.2L HEMI. As the final year, collectors and enthusiasts want to keep these cars running perfectly.
P0171 is a common code that is usually not catastrophic but needs to be addressed. Here is a complete guide to diagnosing and fixing it.
Symptoms
- Check engine light illuminated
- Rough or choppy idle
- Hesitation on acceleration
- Fuel economy below normal
- Possible misfires
- Reduced throttle response
Common Causes
- Vacuum Leak (35% likelihood) - Intake manifold gasket leaks, cracked vacuum hoses, or a failed PCV valve are the most common sources of unmetered air on both the Pentastar and HEMI engines.
- MAF Sensor Issue (25% likelihood) - Contamination from oiled aftermarket air filters or general degradation can cause the MAF sensor to underreport airflow.
- Fuel System Problem (25% likelihood) - A weakening fuel pump or dirty injectors can reduce fuel delivery. The high-output HEMI engines are particularly sensitive to fuel pressure.
- Exhaust Leak (15% likelihood) - HEMI exhaust manifold bolt issues remain present in the 2023 model. A leak before the Bank 1 O2 sensor creates a false lean reading.
Diagnostic Steps
- Full code scan. Check for companion codes like P0174, misfires, or O2 sensor faults.
- Fuel trim analysis. LTFT above +10% confirms lean. Compare idle trims versus driving trims.
- Visual and smoke inspection. Check all vacuum hoses and intake connections. Use a smoke machine for thorough testing.
- MAF sensor evaluation. Clean with dedicated MAF cleaner. Check live data readings.
- Fuel pressure test. Compare to factory specifications at idle and under load.
Repair Costs
- Vacuum leak repair: $75 - $350.
- MAF sensor service: $15 - $280.
- Fuel pump replacement: $400 - $850.
- Exhaust manifold repair: $250 - $700.
Preserving Your Final-Year Challenger
As the last ICE Challenger, maintaining your 2023 model in top condition protects both your driving experience and its long-term value. Use OEM or high-quality parts for any repairs. If you have a Scat Pack, Hellcat, or Demon 170, consider using a Dodge dealer for warranty and documentation purposes.
Prevention Tips
- Use OEM or quality dry air filters
- Fill up with premium fuel as required
- Have exhaust manifold bolts checked periodically
- Inspect vacuum system during maintenance
- Maintain complete service records for future value